fix: formatting code for draw model

docs/beginner/tutorial9-models/README.md

@@ -389,12 +389,9 @@ Before we can draw the model, we need to be able to draw an individual mesh. Let
 // model.rs
 pub trait DrawModel<'a> {
     fn draw_mesh(&mut self, mesh: &'a Mesh);
-    fn draw_mesh_instanced(
-        &mut self,
-        mesh: &'a Mesh,
-        instances: Range<u32>,
-    );
+    fn draw_mesh_instanced(&mut self, mesh: &'a Mesh, instances: Range<u32>);
 }
+
 impl<'a, 'b> DrawModel<'b> for wgpu::RenderPass<'a>
 where
     'b: 'a,
@@ -403,11 +400,7 @@ where
         self.draw_mesh_instanced(mesh, 0..1);
     }
 
-    fn draw_mesh_instanced(
-        &mut self,
-        mesh: &'b Mesh,
-        instances: Range<u32>,
-    ){
+    fn draw_mesh_instanced(&mut self, mesh: &'b Mesh, instances: Range<u32>) {
         self.set_vertex_buffer(0, mesh.vertex_buffer.slice(..));
         self.set_index_buffer(mesh.index_buffer.slice(..), wgpu::IndexFormat::Uint32);
         self.draw_indexed(0..mesh.num_elements, 0, instances);